JP2831578B2 - Method of manufacturing heat exchanger with bracket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a heat exchanger provided with a bracket, and more particularly, to a method of manufacturing a heat exchanger having a fin interposed therebetween such as a multi-flow type or a parallel flow type. A heat exchanger in which a header is connected to both ends of a plurality of tubes arranged in a stack and used as, for example, a condenser or a radiator for a car air conditioning system, and a bracket is attached to the header. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger used as a condenser for a car air conditioning system, for example, a plurality of flat tubes stacked in the thickness direction with corrugated fins interposed therebetween; A heat exchanger referred to as a multi-flow type or a parallel flow type is known which includes a pair of tubular headers arranged at these both ends and having tube ends communicated with each other.

[0003] A bracket must be attached to this type of heat exchanger in order to attach it to an attachment side of a vehicle body or the like.

[0004] As this type of bracket, for example, a header adjoining portion formed in a corresponding shape to be snugly adjoined to the outer peripheral surface of the header, and a bracket extending from the adjoining portion and attached to a mounting side of a vehicle body or the like. It is conceivable to use a type that has a mounting portion and is integrated by brazing while the header contact portion is in contact with the header. FIG. 10 shows an example of such a bracket. This bracket (100) has a header adjacent to an outer peripheral surface of a header (3) (4) formed in a corresponding shape to conform to an appropriate state. Part (110), an extension part (120) extending in the direction orthogonal to the tube (1) from the adjacent part, and a mounting hole part (130a) (130) extending from the tip end in the tube direction.
b) has a mounting portion (130) formed therein.

[0005] Therefore, it is conceivable to manufacture a heat exchanger having such a bracket as follows.

That is, a plurality of tubes (1) are arranged in parallel at a predetermined distance from each other, fins (2) are interposed between adjacent tubes, and both ends of the tube (1) are further provided. The heat exchanger body (A) is temporarily fixed by connecting the headers (3) and (4) to each other. Then, as shown in FIG. 10, the header (3)
(4) The header contact part (11) of the bracket (100)
0) is positioned adjacent to the bracket (100) so that the mounting portion (130) of the bracket (100) is parallel to the tube (1). In this state, using the temporary fixing jig (150), the bracket (100) is attached to the header (3) (4).
Temporarily fix it by pressing it. The temporary fixing jig (150) includes a header contact part (110), an extension part (120), and a mounting part (13) of the bracket (100).
A bracket contact surface (150) formed in a corresponding shape so as to surround the outer peripheral surface side of (0) closely and closely.
a), and are actuated in a direction toward and away from the headers (3) and (4) by a driving device (17) connected to the other side surface. Thus,
The temporary fixing jig (150) is moved closer to the headers (3) and (4) by the advance operation of the driving device (17), and the bracket contact surface (150a) comes into contact with the outer peripheral surface of the bracket (100) and the bracket (100) is moved. (100) is the header (3)
(4) is pressed and temporarily fixed.

In the temporarily fixed state, a plurality of peripheral portions of the header abutting portion (110) are partially welded to the headers (3) and (4) by argon welding or the like, and then the temporary fixing jig (150) is mounted. Separate. At this time, the bracket (10
Part (0) is in a state where a part thereof is temporarily fixed to part (4) by welding. After that, when the components of the heat exchanger body (A) are brazed together in a furnace, the bracket (100) and the headers (3) and (4) are integrated by brazing together. .

[0008]

However, as described above, the bracket (100) is used by using the temporary fixing jig (150).
Is pressed down and temporarily fixed to the headers (3) and (4), the bracket contacting surface (150a) of the jig (150) is disposed along the entire outer surface of the bracket (100). It is not always the case that the state is properly positioned. For example, as shown in FIG. 11, the bracket (100) is rotated with respect to the headers (3) and (4) because a part of the bracket contact surface (150a) comes into contact with the mounting portion (130) or the like. Misalignment can occur. Such inconvenience tends to occur particularly when the cross-sectional shape of the headers (3) and (4) is circular. When the bracket (100) is attached to the headers (3) and (4) in such a state of being shifted, the bracket (100)
The mounting position of the heat exchanger becomes inappropriate and the heat exchanger body (A)
May not be mounted on the mounting side of the vehicle body or the like. Therefore, the above-mentioned temporary fixing operation must be carefully performed so that the bracket (100) is in an appropriate temporary fixing state without being displaced with respect to the headers (3) and (4). Further, if the bracket (100) is pressed against the headers (3) and (4) by the temporary fixing jig (150) in the inappropriate state as described above, the bracket (100) is deformed. Even things can happen.

As a countermeasure for preventing such a displacement, it is conceivable to prevent the rotation of the bracket (100) by disposing a stopper on the side opposite to the temporary fixing jig (150) at the time of temporary fixing. However, in this case, it is necessary to prepare a stopper in addition to the jig (150), and the temporary fixing work is not only troublesome, but also depending on the shape of the bracket (100), the stopper may be installed. Sometimes it is difficult or even impossible to install itself.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and when a bracket is joined to and integrated with a header constituting a heat exchanger main body, a temporary fixing in which the bracket is positioned with high precision with respect to the header. It is an object of the present invention to provide a method of manufacturing a heat exchanger in which a bracket is joined to a header in a desired and appropriate state without displacement.

[0011]

SUMMARY OF THE INVENTION Accordingly, the present invention provides
As the bracket, one having a convex portion or a concave portion for positioning formed on the outer peripheral surface thereof is used, and as a temporary fixing jig, a concave portion or a convex portion for positioning corresponding to the convex portion or the concave portion is formed on the bracket contact surface. Use what you have,
When the bracket is temporarily fixed to the header, the corresponding convex portion and the concave portion are fitted to each other in a positioning state, and in this state, the header contact portion and the header are partially welded and temporarily fixed. After that, when the heat exchanger components are brazed and integrated, they are also brazed and integrated.

That is, the present invention provides a plurality of heat exchange medium distribution tubes stacked in parallel with each other with fins interposed therebetween, and a pair of cylindrical tubes connected to both ends thereof. A heat exchanger body having a header, and a bracket attached to at least one of the headers, wherein the bracket has a header contact portion integrally joined to the header along the header. In the method for manufacturing a heat exchanger provided with, while using a bracket having a positioning convex or concave portion formed on the outer peripheral surface thereof, the header contact portion of the bracket is brought into contact with the header. In the state, using a temporary fixing jig having a concave portion or convex portion for positioning corresponding to the convex portion or concave portion on the bracket contact surface,
After temporarily fixing the bracket by pressing the bracket against the header in a positioning state in which the corresponding projections and recesses are fitted to each other, after partially welding the header contact portion and the header in that state. A method for manufacturing a heat exchanger including a bracket, characterized in that when the constituent members of the heat exchanger body are collectively brazed to each other, the bracket and the header are brazed and integrated. Is what you do.

[0013]

When the bracket is temporarily fixed by pressing the bracket against the header using the temporary fixing jig, the convex portion or the concave portion formed on the bracket contact surface of the jig corresponds to the corresponding one formed on the outer peripheral surface of the bracket. Mates with concave or convex parts. This fitting prevents the bracket from being displaced with respect to the header, and temporarily fixes the bracket to the header in an appropriate positioning state.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on illustrated embodiments.

FIGS. 1 to 8 show a heat exchanger used as a condenser made of aluminum (including its alloy) according to a first embodiment of the present invention.

This condenser, together with an evaporator, a compressor, and other devices, constitutes a refrigeration cycle for car air conditioning.
A condenser for a car air conditioning system in which a high-pressure gaseous refrigerant is conducted and exchanges heat with air to liquefy the refrigerant.

In these figures, (A) is a heat exchanger main body, and the main body (A) has a plurality of flat tubes (1) arranged in a thickness direction at predetermined intervals in a horizontal state;
It has a corrugated fin (2) interposed between adjacent flat tubes (1).

The flat tube (1) is made of a flat porous extruded member made of aluminum. The tube (1) has one or a plurality of partition walls along the longitudinal direction connecting the upper and lower walls formed therein, thereby improving pressure resistance. Instead of a tube made of such a flat porous extruded material, a corrugated fin is inserted into a flat tube such as an electric resistance welded tube formed in a flat shape, and the fin is brazed into the flat tube to raise and lower the flat tube. A wall connected by fins may be used. In addition, a hole or a notch may be formed in the partition wall in the flat tube so that the refrigerant flows between adjacent unit refrigerant passages defined by the partition wall. Further, instead of such a partition wall, one having a large number of convex portions connecting the upper and lower walls may be used. The corrugated fin (2)
Has approximately the same width as the flat tube (1) and is joined to the tube (1) by brazing. The corrugated fin (2) is also made of aluminum, and desirably a louver cut and raised. The heat exchanger body (A) has a pair of left and right headers (3) and (4).

Each of the headers (3) and (4) is formed by forming a brazing sheet having a brazing material layer coated on one side or both sides into a cylindrical shape, and welding the abutting edges thereof by electric resistance welding. It is formed with an aluminum electric resistance welded pipe having a circular cross section which is excellent in pressure resistance. Each header (3)
In (4), tube insertion holes having a shape corresponding to the cross-sectional outer peripheral shape of the flat tube (1) are formed at predetermined intervals along the length direction, and each tube (1) is inserted into the insertion hole. Are inserted by a predetermined amount, and in the inserted state, the brazing material layer is joined and connected in a strong and liquid-tight state by brazing.

Further, a partition plate (5) is inserted and arranged at a position slightly above the middle portion in the vertical direction of the left header (3) from a slit formed in the outer peripheral surface of the header (3) in the circumferential direction. The inside of the header (3) is divided into two upper and lower chambers by a partition plate (5). Similarly, in the right header (4), a partition plate (6) is inserted and arranged at a position slightly lower than the middle portion in the vertical direction, and is integrated by brazing, so that the inside of the header (3) is divided into two upper and lower chambers. It is partitioned.

On the outer side of the left header (3) slightly above the partition insertion position, a refrigerant inlet pipe (7) made of aluminum is brazed with its base end connected to the header (3). Fixed. On the other hand, on the outer surface of the right header (4) slightly below the partition insertion position, an aluminum refrigerant outlet pipe (8) is brazed and fixed with its base end communicating with the header (4). Have been.

By installing the partition plates (5) and (6), the refrigerant flowing from the refrigerant inlet pipe (7) into the upper compartment of the left header (3) is connected to the upper compartment. After flowing through the first path constituted by the plurality of tubes (1), the gas flows into the upper compartment of the right header (4). The refrigerant flowing into the compartment makes a U-turn in the compartment, and a plurality of intermediate tubes (1) partitioned by the partition plates (5) and (6) of the left and right headers (3) and (4). And flows into the lower compartment of the left header (3). The refrigerant flowing into the compartment makes a U-turn in the compartment, and circulates through a final path formed by a plurality of tubes (1) connected to and connected to the lower compartment of the right header (4). After flowing into the lower compartment of the header (4), it flows out from the refrigerant outlet pipe (8).

As described above, the refrigerant flows in a meandering manner over all the refrigerant passages constituted by the plurality of tubes (1) and is condensed by performing heat exchange with external air. I have.

Reference numerals (9) and (9) in the drawing are disposed outside the corrugated fin (1) disposed outside the outermost tube (1), and are integrally brazed to the fin (1). It is an aluminum side plate.

Aluminum brackets (1) for mounting the heat exchanger body (A) on the mounting side of a vehicle body or the like are respectively provided on both upper and lower ends of the left and right headers (3) and (4).
0), (10), (10), and (10) are attached.

Each of the brackets (10) is an integrally molded product made of an extruded aluminum material. As shown in FIGS. 4 to 8, the bracket (10) includes a header contact portion (11) formed in a corresponding shape to conform to the outer peripheral surface of the header (3) (4) in a suitable state, An extension (1) extending from the adjacent portion in a direction orthogonal to the tube (1).
2) and a mounting portion (13) extending from the end thereof in the tube direction and having mounting holes (13a) (13b) formed therein. The overall shape of the bracket is
The present invention is not limited to the one formed in a substantially L shape in plan view as shown in the embodiment, but may be such that the mounting portion is directly extended from the header contact portion at a predetermined angle to the tube. In other words, a type having a header adjoining portion fixedly attached to the header and having a shape and size such that the adjoining portion cannot be temporarily fixed to the header in a self-holding state. , Any other design changes are allowed.

The header contact portion (11) is sized so as to cover the headers (3) and (4) so as not to exceed a half circumference thereof. The angle formed between both end edges of the adjacent portion (11) and the central axes of the headers (3) and (4) is 1
80 degrees or less and the header (3)
The header is not in a self-holding state simply by being arranged alongside (4). In this embodiment, the angle is set to about 147 degrees. The extending portion (12) extends from a middle portion in the circumferential direction of the contact portion (11) along a tangential direction thereof. The mounting portion (13) extends from a tip of the extension portion (12) in a direction orthogonal to the extension portion, and has two mounting holes (13a) and (13b). I have.

The bracket (10) has a positioning protrusion having a triangular cross section along the vertical direction over the entire length near the boundary between the abutting portion (11) and the extending portion (12). The ridge (convex portion) (14) is formed integrally.
The ridges (projections) (14) are formed into correspondingly shaped ridges (recesses) (16) formed on a temporary fixing jig (15) described later.
And acts as a projection for positioning the bracket (10). Thus, as shown in FIGS. 1 to 3, the upper portions of the left and right headers (3) and (4)
Each of the brackets (10) and (10) has its attachment portion (13) arranged on the front side of the heat exchanger body (A), and the abutment portion (11) on the outer peripheral surface of the header (3) (4). It is brazed and integrated alongside. On the other hand, under the left and right headers (3) and (4), the brackets (10) and (10) respectively abut the mounting portions (13) on the rear side of the heat exchanger body (A). Department (11)
Are arranged along the outer peripheral surfaces of the headers (3) and (4) and are integrated by brazing in a state.

The heat exchanger body (A) has the brackets (10), (10), (10) attached thereto.
It can be appropriately mounted on the mounting side of the vehicle body or radiator via (10).

The heat exchanger in which the bracket (10) is attached to the heat exchanger body (A) as described above is manufactured as follows.

That is, a plurality of tubes (1) are arranged in parallel at a predetermined distance from each other, fins (2) are interposed between adjacent tubes, and both ends of the tubes (1) are further provided. The heat exchanger body (A) is temporarily fixed by connecting the headers (3) and (4) to each other. Then, as shown in FIG. 7, headers (3) and (4)
The header contact portion (11) of the bracket (10) is arranged alongside, and the mounting portion (13) of the bracket (10) is positioned so as to be parallel to the tube (1). If necessary, the mounting portion (13) may be positioned so as to form a predetermined angle with the tube (1). Then, in this state, using the temporary fixing jig (15), the bracket (1) is used.
(0) is temporarily fixed by pressing it on the headers (3) and (4). The temporary fixing jig (15) includes a header contact portion (11) and an extension portion (1) of the bracket (10).
2) has a bracket contact surface (15a) formed in a corresponding shape so that a part of the outer peripheral surface side can be closely contacted, and the contact surface corresponds to the ridge (convex portion) (14). A concave streak (recess) 16 is formed. The jig (15) is connected to a driving device (1) connected thereto.
7) is adapted to be actuated in a direction toward and away from the headers (3) and (4).

Then, the temporary fixing jig (15) is moved closer to the headers (3) and (4) by the advance operation of the driving device (17), and as shown in FIG. Part)
The bracket contact surface (15a) is connected to the bracket (1) by fitting the concave streak (recess) (16) into (14).
The bracket (10) is temporarily fixed in a state where the bracket (10) is pressed against the headers (3) and (4) by making contact with the outer peripheral surface of (0). In the pressing process, the ridges (projections) (14) are fitted into the ridges (recesses) (16), so that the bracket (10) moves in the circumferential direction with respect to the headers (3) and (4). It is possible to prevent rotation and a misalignment state. The bracket (10) is the header (3)
Even when the bracket (10) is arranged adjacent to the bracket (10) in a state of being slightly displaced in the circumferential direction with respect to (4), the ridge (convex portion) (14) having a triangular cross section of the bracket (10) and the jig ( 1
5) The bracket (10) is rotated in the circumferential direction so as to eliminate the displacement by the interaction with the ridge (recess) (16) having a shape corresponding to the ridge (convex) (14). The desired correct arrangement is achieved.

Then, in the temporarily fixed state, a plurality of peripheral portions of the header adjacent portion (11) are partially welded to the headers (3) and (4) by argon welding or the like, and then the temporary fixing jig (15) is mounted. Separate. At this time, a part of the bracket (10) is temporarily fixed to the headers (3) and (4) by welding.

Thereafter, when the components of the heat exchanger body (A) are brazed together in a furnace, the bracket (10) and the headers (3) and (4) are integrated by brazing. Complete. The brazing of the bracket (10) and the headers (3) and (4) is performed by a brazing material layer coated on the header (10).

FIG. 9 shows another embodiment, in which a ridge (convex portion) (26) is formed on the temporary fixing jig (25) side, and the ridge is formed on the bracket (20) side. Article (convex)
A ridge (recess) (24) corresponding to (26) is formed,
When the bracket (20) is temporarily fixed to the headers (3) and (4) using the jig (25), the ridges (convex portions) (26) of the jig (25) are changed to the concave ridges of the bracket (20). (Recess)
(24). Thus, the ridge (convex portion) (26) and the bracket (2) are located on the jig (25) side.
Even when the concave streak (recess) (24) is formed on the 0) side, the bracket (20) is attached to the header (3) (4) in the same manner as in the previous embodiment.
, And the inconvenience such that the bracket (20) is rotated in the circumferential direction of the headers (3) and (4) is avoided.

Since the other structure is completely the same as that of the above-mentioned embodiment, the corresponding portions are denoted by the same reference numerals and the description thereof will be omitted.

In the above-described embodiment, the projections and the depressions for positioning are formed by adopting the projections and the depressions having a triangular cross section. However, the specific shape is not necessarily limited to this. Absent. For example, the cross-sectional shape may be a trapezoidal ridge and a corresponding ridge, or, instead of a long ridge and a ridge extending in the axial direction of the header, for example, a triangle. Cone,
Short protrusions such as quadrangular pyramids, cones, and the like, and corresponding depressions may be used. In addition, in the case of such a short convex portion and the corresponding concave portion, not only the bracket is prevented from being displaced in the circumferential direction with respect to the header, but also is prevented from being displaced in the vertical direction. In short, any other shapes are acceptable as long as they can be fitted to each other to reliably position the bracket with respect to the header. Further, it is necessary that at least one pair of such convex portions and concave portions for positioning be used, but there may be plural pairs.

The projections and recesses are fixed to the brackets (10) (20) by temporary fixing jigs (15) (25).
Before the brackets (10) and (20) are arranged side by side with the headers (3) and (4) before they are pressed and temporarily fixed to the headers (3) and (4). Also, a convex portion having a tapered cross-sectional shape such as a triangular cross-section is used as the convex portion so that the positional deviation is corrected by the interaction between the positioning convex portion and the concave portion, and the concave portion corresponds to the convex portion. It is desirable to use a material having a shape.

In the above embodiment, a method for manufacturing a heat exchanger used as a condenser for a car air conditioning system or a room air conditioning system has been described as an example, but the present invention is not limited to this. . Headers are connected and connected to both ends of a plurality of tubes arranged in parallel in a state where fins are interposed therebetween such as a multi-flow type or a parallel flow type, and at least one of the headers is connected. As long as the bracket is attached to the heat exchanger, various heat exchangers such as an evaporator, a radiator, and an oil cooler can be applied to manufacture these heat exchangers.

[0040]

According to the present invention, as described above, when the bracket is partially welded to the header, a bracket having a convex or concave portion for positioning formed on the outer peripheral surface thereof is used. In a state where the header contact portion is in contact with the header, using a temporary fixing jig having a positioning concave portion or a convex portion corresponding to the convex portion or the concave portion on the bracket contact surface, the corresponding convex portion is used. Since the bracket is temporarily fixed by pressing the bracket against the header in a positioning state in which the portion and the recess are fitted, the bracket is expected with respect to the header by the interaction between the positioning projection and the recess. Can be positioned with high precision and temporarily fixed.

Accordingly, it is possible to prevent the bracket from being mounted on the header in a state where the heat exchanger is displaced, so that the heat exchanger body cannot be mounted on the mounting side of the vehicle body or the like. Further, it is possible to avoid the inconvenience that the bracket is deformed by being pressed against the header by the temporary fixing jig in a state where the bracket is displaced.

Furthermore, it is not necessary to dispose a stopper separately from the temporary fixing jig at the time of the temporary fixing, so that the temporary fixing workability can be further improved.

[Brief description of the drawings]

FIG. 1 is a front view of a heat exchanger manufactured by a method according to the present invention.

FIG. 2 is a plan view of the heat exchanger.

FIG. 3 is a right side view of the same heat exchanger.

FIG. 4 is an overall perspective view of a bracket.

FIG. 5 is a front view of the bracket.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;

FIG. 7 is an explanatory view showing a state immediately before the bracket is brought into a state of being adjacent to the header and temporarily fixed using a temporary fixing jig.

FIG. 8 is an explanatory view showing a temporarily fixed state in which a bracket is pressed against a header using a temporary fixing jig.

FIG. 9 is an explanatory view corresponding to FIG. 7 showing a modification.

FIG. 10 is an explanatory view corresponding to FIG. 7, using a bracket and a temporary fixing jig which are different from the present invention and have no corresponding convex portions and concave portions.

FIG. 11 is an explanatory view corresponding to FIG. 8 and using a bracket and a temporary fixing jig which are different from the present invention and have no corresponding convex portions and concave portions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube 2 Fin 3 Header 4 Header 10 Bracket 11 Header contact part 14 Protrusion (convex) 15 Temporary fixing jig 15a Bracket contact surface 16 Concave (concave) 20 Bracket 24 Concave (concave) 25 Temporary fixing Jig 26 ridges (convex) A heat exchanger body

Continuation of the front page (56) References JP-A-4-169793 (JP, A) JP-A-3-86369 (JP, A) JP 6-12381 (JP, Y2) (58) Fields investigated (Int) .Cl. ⁶ , DB name) B23K 1/00 330 B23K 1/18 B23K 3/00 310 F28F 9/00 321

Claims (1)

(57) [Claims] 1. A heat exchanger comprising a plurality of tubes for distributing heat exchange medium, which are stacked in parallel with each other with fins interposed therebetween, and a pair of cylindrical headers connected to both ends thereof. A heat exchanger having a heat exchanger body and a bracket attached to at least one of the headers, wherein the bracket is formed by joining and integrating a header contact portion of the bracket in a state of being attached to the header. In the method of manufacturing an exchanger, while using a bracket having a positioning convex or concave portion formed on an outer peripheral surface thereof as the bracket, while the header contact portion of the bracket is in contact with the header, Using a temporary fixing jig having a positioning concave portion or a convex portion corresponding to the convex portion or the concave portion on the bracket contact surface, the corresponding convex portion and the concave portion are fitted. In the aligned positioning state, the bracket is temporarily fixed by being pressed against the header, and in this state, the header contact portion and the header are partially welded. A method of manufacturing a heat exchanger having a bracket, wherein the bracket and the header are brazed together when brazing at a time.